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A new light bulb is being considered for use in an office with computers. It is decided that the new bulb will only be used if it has a mean lifetime of more than 500 hours. A random sample of 40 bulbs is selected and placed on life test. The mean and standard deviation are found to be 505 hours and 18 hours, respectively. Perform the appropriate test of hypothesis to determine whether the new bulb should be used. Use a 0.01 level of significance.
A. 0 tailedB. 2 tailedC. 1 tailed leftD. 1 tailed righ
a random sample of size 38 is chosen from a population with an unknown mean and variance. the sample mean and standard
If the standard deviation of the population is 9 hours, determine whether there has been a significant increase in battery life expectancy.
if iq scores are normally distributed with a mean of 100 points and a standard deviation of 15 points what proportion
Using the probabilities above what is the expected size of family you draw?
determine the point estimate of the population mean and margin of error for the confidence interval. lower bound is 16
What is the probability of getting the first questions correct and miss the fourth with five possible answers to each question?
Are the data sufficient to conclude that children with a history of childcare show significantly more behavioral problems than the average kindergarten child? Use a one-tailed test with a = .01.
Research results suggest that IQ scores for boys are more variable than IQ scores for girls (Arden & Plomin, 2006). A typical study looking at 10-year-old children classifies participants by gender and by low, average, or high IQ.
1. construct a frequency distribution table to organize the following set of data109nbspnbsp 114nbspnbsp 111nbspnbsp
A fair coin is continually flipped until heads appears for the tenth time. Let X denote the number of tails that occur. Compute the probability mass function of X.
the following data are the temperatures of effluent at discharge from asewage treatment facility on consecutive days43
A certain component is critical to the operation of an electrical system and must be replaced immediately upon failure. If the mean lifetime of this type of component is 100 hours and its standard deviation is 30 hours, how many of the components ..
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